Talking to the official Windows blog, Windows and Devices Group Vice President Gabe Aul has revealed an upcoming build of Windows 10 will let users register the platform using their existing Windows 7, Windows 8 and Windows 8.1 keys:

“If you install this build of the Windows 10 Insider Preview on a PC and it doesn’t automatically activate, you can enter the product key from Windows 7, Windows 8 or Windows 8.1 used to activate the prior Windows version on the same device to activate Windows 10 by going to Settings > Update & security > Activation and selecting Change Product Key,” he explained....

But despite this extremely positive development, a number of pertinent questions remain....

I'm as in the dark as you are about what happened with the site during most of yesterday and today, but I've asked the admins what they can tell me about it. I'll let you know if I learn anything significant.

Best,
-- Al

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"I didn't say I didn't say it. I said that I didn't say that I said it. I want to make that very clear."
-- George Romney, in 1968, while campaigning for the Republican nomination for President of the United States.